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　 不管是预埋在墙体内的刚性防水套管和柔性防水套管由混凝土浇注后和钢筋结构成为一块完整墙体，有些劣质混凝土浇注后表面存在一些微小的裂缝和穿孔，这些微小的缝隙为防水套管材质铁离子创造了运动空间，而防水套管的腐蚀氧化程度取决于材质离子扩散取决于材质离子扩散速率造成大面积氧化腐蚀。

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